Benchmark: for vs forin - MeasureThat.net

Tests:

for loop
const code = ` <style> :component(DropDown) { .rounded { border-radius: 0.5rem; } } /* .rounded { border-radius: 0.5rem; } */ </style> `; // Array to store positions of opening and closing braces const positions = []; for (let i = 0; i < code.length; i++) { if (code[i] === '{' || code[i] === '}') { positions.push({ char: code[i], position: i }); } }
forin loop
const code = ` <style> :component(DropDown) { .rounded { border-radius: 0.5rem; } } /* .rounded { border-radius: 0.5rem; } */ </style> `; // Array to store positions of opening and closing braces const positions = []; let index = 0; for (const key of code) { index++; if (key === '{' || key === '}') { positions.push({ char: key, position: index }); } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
for loop
forin loop

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Windows

View result in a separate tab

Test name	Executions per second
for loop	2982681.5 Ops/sec
forin loop	1046406.7 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Definition JSON**

The benchmark definition is a simple JSON object that provides metadata about the test case:

* `Name`: The name of the benchmark, which in this case is "for vs forin".
* `Description`: An empty string, indicating that no description is provided.
* `Script Preparation Code` and `Html Preparation Code`: Empty strings, indicating that no script or HTML code needs to be prepared before running the test.

**Individual Test Cases**

There are two test cases:

1. **"for loop"`**

The benchmark definition for this test case is a JavaScript string containing CSS code with some formatting rules applied using the `:component` pseudo-class. The code also includes an array `positions` to store the positions of opening and closing braces.

The test script uses a traditional `for` loop to iterate over each character in the code, checking if it's an opening or closing brace (`{` or `}`) and pushing its position into the `positions` array.

2. **"forin loop"`**

This test case is similar to the previous one, but instead of using a traditional `for` loop, it uses the `for...of` loop syntax to iterate over each character in the code. The logic for checking if a character is an opening or closing brace remains the same.

**Options Being Compared**

The two options being compared are:

* Traditional `for` loop (`"for loop"` test case)
* `for...of` loop syntax (`"forin loop"` test case)

**Pros and Cons of Each Approach**

1. **Traditional `for` Loop**
	* Pros:
		+ Generally faster, as it doesn't require a separate variable for iteration.
		+ Can be more straightforward to implement in certain cases.
	* Cons:
		+ May not be as concise or expressive as the `for...of` loop syntax.
2. **`for...of` Loop Syntax**
	* Pros:
		+ More concise and readable, especially when working with iterable objects.
		+ Can be more efficient in some cases, as it avoids creating a separate variable for iteration.
	* Cons:
		+ May require additional setup or preparation to use correctly.

**Other Considerations**

Both approaches have their own set of considerations:

* Performance: The choice between `for` and `for...of` loops can affect performance, especially in cases where iteration is expensive. However, the difference may be negligible in most cases.
* Code Readability and Maintainability: While the `for...of` loop syntax can be more concise, it's essential to consider code readability and maintainability when choosing an approach.

**Library Usage**

In this benchmark, no external libraries are used. The code is a simple JavaScript string containing CSS rules and formatting.

**Special JS Features or Syntax**

There are no special JavaScript features or syntax being tested in this benchmark. However, the `for...of` loop syntax is a relatively recent addition to the language (introduced in ECMAScript 2015), so it's worth noting that older browsers may not support it.

**Alternatives**

If you're interested in exploring alternative approaches, here are some other options:

* `while` loop: A traditional loop that uses a conditional statement to control iteration.
* `forEach` method: A built-in array method for iterating over elements in an iterable object.
* Recursion: Using function calls to iterate over elements, which can be more concise but may lead to stack overflows.

Keep in mind that the choice of loop type depends on the specific use case and requirements.

Related benchmarks:

for vs forin (version: 0)

Comparing performance of: for loop vs forin loop

Created: one year ago by: Guest

Jump to the latest result

for loop

forin loop

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):